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SECTION 4 – IP and Mesh Products

Netstream IP Solutions

Urban Surveillance Mobile and Fixed Infrastructure

What is Streaming Video?

The transmission of compressed video across an IP network is often

known as ‘streaming’ video and can vary from full frame rate high

quality to reduced resolution low quality (often called ‘thumbnails’).

Streaming video connections can be point-to-point, going from

one source to one receiver (uni-cast) or from one source to multiple

receivers (multi-cast).

Private Networks v Public Networks

IP Networks can be either private networks, operated by a single

organisation (usually described as Private LANs or WANs - Local Area or

Wide Area Networks), or public networks, where the capacity is shared

between many users (the internet or 3G networks are typical of public

networks).

In a private network such as those operated by many police and

security customers, the capacity available on the network is typically 10

to 100Mb/s and the network is rarely operated close to this capacity.

In a public network the capacity is usually purchased by the user on

a ‘pay per use’ scheme, and the capacity is typically very limited and

is contended in nature. The capacity on contended networks is both

limited and variable. Normally, 200kb/s is available on average, but this

might vary at times from 0kb/s to 500kb/s. This limited, but variable,

capacity makes streaming video of any quality very difficult.

Uni-cast v Multi-cast

Private networks will often allow multi-cast

transmissions, but this may require intervention of the network

controller to configure routers and switches to allow multi-cast video

streaming. Public networks, on the other hand, rarely allow multi-cast

transmissions.

Cobham Surveillance NET-IP Products

Cobham Surveillance produces two types of IP products - IP video

streamers and IP video receivers.

Net-IP Products

Cobham Surveillance NET-IP video streamers

The Netstream video streaming device is suitable for private networks

only, whilst NetLink is suitable for public and private networks alike.

Netstream

This can be installed as an option to some Cobham receivers,

including the SOLO4 receiver, the Central Receiver and the new PRO-

RX and NanoVue receiver products. In some receivers this is a software

option, in others it requires the installation of dedicated hardware -

contact Cobham for details. The Netstream option allows receivers to

stream multi-cast high quality video onto IP networks. Because of high

capacity and the multi-cast nature of the transmission, the Netstream

option will only work on private networks. Typically, it requires 1.2

to 4.8Mb/s of capacity per video service streamed (depends on

user RF transmission parameters). Netstream is most often used as

a mechanism for connecting a remote RF reception point (mast or

tower) to the user control centre (e.g. police station) via a private LAN

network. The Netstream product adds very little delay to the RF video,

maintains the selected AES security and causes no loss of quality.

NetLink

Cobham NetLink is a stand-alone boxed product that can connect

to Cobham receivers and enables streaming video on to public or

private networks. When connected to private networks, the NetLink

generates a high quality multi-cast video stream. When connected to

a public network, it produces a reduced frame rate thumbnail stream

at a data rate matching that available on the network.

Cobham Surveillance IP receivers

There are two main types of IP receiver products in Cobham’s range:

the PC based software IP receivers (also called ‘players’); and hardware

based IP receivers.

Introduction to Cobham Surveillance NET-IP products

Cobham Surveillance has designed a range of products with domo technology at their core (under the common name of NET-IP) that allow the

secure transmission of video data across IP networks. Distribution of high quality video data across real-world IP networks is non-trivial, because

typically networks are restricted in terms of capacity and may contain security features that prevent such transmissions. The following brief

guide is aimed at helping customers understand these issues and select appropriate products. For more detailed information, contact Cobham

Surveillance, and a training course can be arranged.

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